Ultrasonic Scanning Microscopy Testing of Integrated Circuit Quality Testing Technology

Date：2024-01-16 17:28:22Views：233

Ultrasonic scanning microscope is another important non-destructive testing equipment, in addition to X-ray testing equipment mentioned in the previous article. It uses ultrasound to image microscopic objects. Compared with other microscopy techniques, ultrasound, as a mechanical wave, can vibrate and propagate inside materials. When its sound wave propagation encounters interfaces of different materials, some of the sound waves will reflect and some will penetrate. The intensity of this emitted echo will vary due to differences in material density, therefore, the basic elements of sound waves require a certain medium (such as pure water). The smaller the distance between the medium, the faster the speed of sound wave propagation. These different physical effects determine the characteristics of the received signal. Ultrasonic scanning microscopy utilizes these features to generate visual contrast microscopy images, which can be observed by inspectors to discover internal defects in the material.

With the development of ultrasonic scanning detection technology, the scanning mode of acoustic signals has expanded from the most basic A-scan, B-scan, C-scan to multi-layer cross-sectional X-scan, C+T combined scan S-scan. Testing personnel can choose different scanning modes or combine them based on different samples and defect characteristics. For the localization analysis of interface defects, regardless of the scanning mode used, it is based on whether there is a phase change in the acoustic signal after reflection at the interface to determine whether there are defects at the interface.

Plastic sealed devices belong to non airtight devices that are sensitive to moisture. Compared with sealed devices, their resistance to the environment is poor, especially the defects caused by moisture intrusion, corrosion, and stress are more prominent. Once the plastic sealed device is invaded by moisture, various reactions can easily occur under isothermal welding conditions, leading to delamination. The accumulation of water vapor or ions in the layered area can cause internal delamination, bonding damage, metalization corrosion or thermal expansion, and even popcorn phenomenon in plastic sealed devices under certain conditions (such as welding, temperature changes). Ultrasonic scanning technology has shown high sensitivity and effectiveness in detecting internal packaging structures, cracks, delamination defects, gaps, and foreign object phenomena in materials.

The Chuangxin Online Testing Laboratory has been equipped with a full range of probes from low frequency 15MHz, 30MHz, 50MHz, 75MHz, to high frequency 100MHz, 230MHz, etc., which can meet the testing needs of different packaged integrated circuits such as SOP, DIP, PLCC, TO, QFP, BGA, SOT, QFN, TQFP, DFN, Flip Chip, WLCSP, FCBGA, as well as PCB boards, IGBTs, capacitors. Multi directional and fully covered ultrasonic scanning and testing can improve the research and development efficiency for customers in the early stage and process improvement; To control quality for customers and enhance their trust; Find the cause of failure for terminal products, reduce customer complaints, and avoid losses.

Next, we will introduce five important ultrasound scanning modes: A-scan, B-scan, C-scan, multi-layer cross-sectional X-scan, and S-scan with C+T combination scan, as well as some distinctive cases in ultrasound scanning.

Sharing of ultrasonic scanning cases in Chuangxin online testing:

From the above cases, it can be seen that ultrasonic scanning detection has a strong ability to lock in internal defects of plastic packaging devices, and can even fully perceive signs of sample re polishing and typing. It can be seen that ultrasonic scanning detection can play an irreplaceable role in quality control, failure analysis, and authenticity identification. If customers have any needs for ultrasonic scanning testing, please feel free to contact Chuangxin Online Testing Laboratory. We will serve you wholeheartedly with advanced equipment and a sincere attitude.